hadley/ggplot2 — pull request #770 by wch (2013-02-27 19:28:26+00:00)
Title: Fixes for stat_summary

This fixes #732 and #739. It reverts the change that fixed #622, so that will break again. Unfortunately, I don't think it's possible to make it so that `stat_summary` can satisfy both the path and crossbar drawing because of the way grouping works. This change favors path drawing because that is seems to be a more common use case.